/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Report whether a given name is the proper format for a PackageName, without checking whether it is in one of the registered mount points
true if valid text for a long package name
static bool IsValidTextForLongPackageName ( FStringView InLongPackageName, [FText](API\Runtime\Core\Internationalization\FText) * OutReason )